Something goes wrong on either end...

I shoot in true HD on my Canon HV20, I'll import it into Final Cut Pro and edit it on an HDV1080i60 timeline, and if I export for YouTube it to 320 x 240 QVGA with letterboxing enabled, it won't letterbox! Then, if I export it as its current size (I can't remember the aspect, but it takes forever to process), I get it as a widescreen video on my Mac in QT, but YouTube won't letterbox it!

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